What is the difference between ChatGPT, Claude, and Gemini?

All three are large language model (LLM) AI assistants:

| | ChatGPT | Claude | Gemini |
|---|---|---|---|
| Company | OpenAI | Anthropic | Google |
| Best at | Coding, general tasks | Long documents, reasoning | Google integration |
| Context window | 128K tokens | 200K tokens | 1M tokens |
| Free tier | Yes | Yes | Yes |

For coding: ChatGPT (GPT-4o) or Claude
For document analysis: Claude (largest context)
For Google Workspace: Gemini

All three are powerful — the best depends on your specific use case.